Hi all,

Long story short, I had my ex-mechanic install some heads on my car a while ago and I did not do my homework properly. I thought they were Performer RPM heads and it turns out these are Performer heads (i.e. non RPM). I found out because it says "EO D 215-33" on the side which happens to mean that they are emission legal which only applies to the Performer. That said, I don't have a part number (nothing available by looking at them).

Then I found that link: http://www.arb.ca.gov/msprog/aftermk...Search+for+EOs

It says that the "EO D 215-33" corresponds to the following Ford heads: 6031, 6032 6034 -6039. Making progress but still not there yet!

Now looking at that other link: http://www.jegs.com/InstallationInst...350-602519.pdf

Performer Ford head #6031 (bare, 1.90") or #6034 (bare, 2.02"); #6032 (complete, 1.90") or #6035 (complete, 2.02")
For emission controlled 1965 & later 289, 302, and 351-W with rocker studs and pushrod guideplates;will not accept rail rockers.

Performer 5.0 Ford head #6036 (bare, 1.90") or #6038 (bare, 2.02"); #6037 (complete, 1.90") or #6039 (complete, 2.02")
For emission controlled 1982 & later 5.0 Liter V8s with pedestal mount rocker rocker arms; will not accept rail rockers.

All in all, it can only be one of these 8 serial numbers. The fact that they came bare of assembled is really not something that I care about so basically, here are the options:

Performer Ford head: 1.90" or 2.02"
Performer 5.0 Ford head: 1.90" or 2.02"

My first question is: what is the difference between the Performer Ford head and the Performer 5.0 Ford head?

Then: what is the difference between 1.90" and 2.02" and why should I care?

And the last one, what would be the best cam to use with those heads? I currently run the Performer RPM and I am somewhat unhappy with the car under 2500 RPM.

Thanks a lot!

 

The EO # is the Air Resources Board "exempt order" # for smog purposes. Most of this bureaucratic crap came about during the early 70's gas wars in an effort to clean up the air. You don't say where you're from, but in CA, EO #'s mean zip for vehicles 30yrs old or more because they don't require smog checks. EO #'s are REQUIRED for aftermarket parts when smogging a vehicle in CA 29 yrs old or newer. Now for the heads, 1.90 and 2.02 refer to the intake valve size. For your motor, and profile, the 1.90 heads would be perfect. The Performer cam you're running should be fine. A glance at the specs looks like its a fairly driver friendly cam. The combo you're running is a typical edelbrock bolt-on setup, so you likely have a carb tuning issue, vs a head problem under 2500RPM. The specific diff between the ford heads and the 5.0 heads, I believe they should be interchangable, so its probably chamber size, deck height, and accessory bolt on locations.

 

Thanks a lot groho!

I am not running the performer cam, I am running the performer RPM cam (because back then, I was under the impression that my heads were RPM too).

 

Groho, the rolling exemption for smog in CA stopped a long time ago. Here's how the law works:

All cars built in '76 or newer are required to have biannual smog inspections.

Cars built in '75 or earlier are exempt from biannual smog testing. This does not mean they are exempt from being required to have smog equipment. All cars built in CA from 1966+, and all cars built elsewhere from 1968+ (iirc) came with some kind of smog equipment. It is still illegal to alter that smog equipment, there is just no biannual check required. However, there are mobile sniffers on some freeways (in LA and supposedly in Sac, but I've never seen one) that could send the registered owner a letter requiring a smog check, and a seriously bent CHP could pop your hood and require you to take the car in for a smog check if they noticed a lot of aftermarket upgrades.

While these situations are rare, they have happened. It's not going to make me ditch my TFS heads and put my air injection back on, but I'm at least aware of the problem.

 

Starfury, I completely agree with what you're saying, a smog equipped vehicle "technically" can't be altered regardless of year. It doesn't help you can now report "gross polluters" with a phone call, too. Don't **** off your neighbor.

 

I don't know if that onerous Big Brother &h!t scares me more than it pisses me off or vice versa.

 

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ok, you are going about this entirely the wrong way.

do you want a mild, moderate or rough idle?

do you want a tire roaster or a tire warmer?

do you want a lite to lite drag car or a freeway flier or inbetween?

do you like to rev your engine to the max rpm often?

what is your compression ratio?

is that a roller or flat tappet cam?

a comp xe262h cam will work well if you have low compression . . a comp xe268h will work well if you have at least 9.5 compression.

if you want a roller cam than something else would be needed.

if you dont have roller cam springs, you will need them for a roller cam.
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